Dust-display device for vacuum cleaning-tools.



I J. s, THURMAN, DUST DISPLAY DEVICE FOR VACUUM CLEANING vTOOLS.

APPLIOATIOH FILED FEB. 18, 1908.

918,932, Patented Apr. 20, 1909 i enn STROTHER THURMAN, o F'sT. LOUIS, MISSOURI.

. Specification of Letters Patent.

DUST-DISPLAY DEVICE FOR VACUUM CLEANING-TOOLS;

Patented April 20, 1909.

Application filed February 18, 1908. Serial No. 416,658).

To all whomit mag concern;

Be it known that I, JOHN Srnornen Tnua- MAN, a citizen of the United States, and resident of St. Louis, Missouri, have invented certain new and useful Improvements in Dust-Display Devices for Vacuum Cleaning- Tools, of which the following is a specification containing a 'full, clear, and exact description, reference being had to the accompanying drawings, forming a part here'efi.

' -.My invention relates to a dust display device for vacuum cleaning tools, the object of my invention bein to construct a device to be located in the tu e or ipe of a cleaning apparatus which conveys t e dust from the c canin tool to the dust tank, and by means of whic device the operator is at all times i enabled to readily-observe the passage of dust through the dust conveying tube of the cleaning apparatus. a

' To thelabove-pur oses, my invention consists in certain nove features of constmction and arrangement of parts, which will be upon the floor, thus forming a support. for

hereinafte'rmore fully set forth, pointed out in the claims, and illustrated in the accompanying drawings, in which Figure 1' is a plan view of the dust display device; Fig. 2 is a vertical section taken on the line 2-2 of Fig. 1'; Fig. 3 is a transverse section taken on the line 3-3 of Fig. 2.

Referring by numeralsto the accom anying drawings :1 designates the base' of the device which is preferablyformed of cast metal in the shape of a bowl, 'and provided on its ed e with an integral vertically disposed wafi 2, the lower edge of which rests the device. l

- Formed through opposite sides of the body 1 are circular openingsB, through which the dust passes in its travel through the device, and screw seated in said openin s are the inner ends of tubes 4, to which t e ends of the vacuum hose are attaclied. f

Formed integral with the u'pperedge of the body 1 is a vertically disposed flan e 5, and positioned on top of the body. 1, within this flange, is a packing ring 6, oi rubber-,ur analogous material.

7 desi mates a hollow hemi-spherical member, of glass. or analogous transparent mate-'- rial, on the lower edge of which is formed a flange 8, which rests upon the ring or gasket 6; and )ositioned on top of said flange, within the ange 5, is a second ringer gasket 9, ofrubber, or analogous material.

1Q designates a retaining ring, which is positioned on top of the ring or gasket 9, and passing through said ring is a series of screws 11 which are seated in the flange 5, thus rigidly uniting the transparent member 7 with the base 1; and the acking rings or askets 6 and 9 enga e on both sides of the ange 8 to thorou hy pack the joint be tween saidbase an member to' prevent the leakage of any airinto the device.

It will be noted that the bowl shaped base 1 and the member 7, when united, form a hollow spheroid, the inner surface of which is practically smooth and unbroken; and the inlet and outlet openings 3 in the base of'the housing are formed directly opposite one an other; and this arrangement readily permits the dust laden air to pass through the entire devicewithout choking, or without breaking its force. v v a When a cleanin apparatus provided with the dust displa evice is. in operation, the operator-by oo ing through the transparentmember 7 can readily observe the amount of dust passing through the dust conveying tube, and by thus noting the cleaning action, can regulate the operation of the cleanin tool of the ap aratus. A device 0 my improved construction is simple, inexpensive, easily applied to the dust conveying tubes of vacuum cleaningsystems; and, when installed, readily (p0 mits an observer to see the passage of through the apparatus.

I claim:-

'1. The combination with the dust conveying tube of a vacuum cleaning apparatus,

'of a housing, the lower 'ortion of which iss' e one another; and a transparent cover for said housing.

3. The combination with the dust cone veying tube of a vacuumcleaning apparatus, of a housing located in the dust conve in tube, the lower portion of which is. ow shaped and provided with inlet. and outlet openings which are arranged directly oppor 7 list e combination with the dust clon site one another; a transparent cover detachably positioned on the housing, and packing rings arranged between the edges of the housing and the transparent cover.

' 4. A dust display device for vacuum cleaning systems, comprising an air tight housing,

the lower portion of which housing is bowl shaped, and provided with inlet and outlet openings which are arranged directly opposite one another and a portion of which housing is transparent.

5. The herein described dust display device for vacuum cleaning systems, comprising a bowl shaped base in which is formed a pair of oppositely disposed openings, tubular members seated in the base and communicating with said openings, an inverted bowlshaped transparent member arranged on the base, flexible packing rings engaging the edges of the transparent member, and a retaining ring fixed to the base and bearing on the upper one of the packim rings.

In testimony whereof, I have signed my name to this specification, in presence of two subscribing witnesses.

JOHN STROTHER THURMAN.

Witnesses:

' W. W. CONKLIN,

M. J. KIMBALL. 

